Jolt ramming-machine.



A. E, OBERG.

JOLT RAMMI NG MACHINE. APPLIGATION FILED AUG.9, 1912 Patented Mar. 30, 1915.-

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ti sunrise PaTEuTT @tFltl ll-Ca AUGUST EVALD OBERG, 0F PLAINFIELD, NEW JERSEY, ASSIGNOR TO MUMFORD MOLD- ING MACHINE COMPANY, OF PLAINFIELD, NEW JERSEY, A CORPORATION OF NEW JERSEY.

\J'OLT RAMMING-MACHINE- Specification of Letters Patent.

Application filed August 9, 1912. Serial No. 714,258.

To all whom it may concern Be .it known that I, AUGUST E. Dunno, a citizen of the United States, residing at Plainfield, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Jolt Hamming Machines, of which the following is a specification.

The invention relates to what are known as jolt ramming machines, and particularly to the valve mechanism for controlling the reciprocating piston. The invention has for its primary objects; the provision of a valve mechanism of simple construction and positive operation; the provision of a valve so positioned as to be protected from grit and dirt, thus insuring a reliable operation; and

the accompanying drawings, wherein Figure l is a vertical section through a jolt ramming machine embodying my invention, and Fig. 2 is a vertical section through a a jolt ramming machine embodying a modified form of my construction.

In the construction illustrated in Figure 1, A is the cylinder of the" apparatus carrying at the top the usual anvil B for receiving the impact of the table; C is the jolt ramming table which may be of any approved type; D is the plunger which is secured to the table C and works in the cylinder A; E is the inlet port leading through the wall of the cylinder; F is the exhaust port; and G is the usual oiling device.

The plunger D is provided upon its interior with the vertical valve chamber 1, such chamber being closed at its bottom by means of the screw plug 2, having the upwardly extending stem 3, upon which stem 3 the valve 4 rests when not held by air pressure in its upper position. The inlet port E communicates with a groove 5 in the exterior surface of the plunger 1), and this groove 5 communicates with the space at the rear of the plunger D by means of the passages 6, 7, 8 and 9. The right hand end of the passage 8 communicates with a second groove 10 in the plunger, such groove 10 being adapted to register with the exhaust port F when the plunger reaches its upper extreme of movement, the usual packing ring being employed to prevent the passage of air to the exhaust until such ring passes the exhaust port. Communication is provided between the rear end of the valve chamber 1 and the rear end of the plunger by means of the relatively small passage 12 to the plug 2.

When air pressure is supplied to the apparatus through the inlet port E, the operation is as follows: Air entering through the inlet E reaches the rear end of the plunger, via the groove 5 and passages 6, 7, 8 and 9, thus causing the plunger to rise. This movement is continued until the groove 10 is brought lnto communication with the exhaust F. 1

front and rear ends of the valve 4 is substantially the same, but as soon as the groove 10 communicates with the exhaust, there-is a sudden release of pressure upon the upper end of the valve 4 due to the relatively large size of the passages 7, 8, as compared with that of the passage 12, so that this valve 4 moved sharply upward as soon as the exhaust port is opened. The uncovering of the exhaust occurs just after the closing of the inlet port E by the plunger, so that no air is permitted to pass directly from the inlet E to the exhaust port F, and all waste at this point is avoided. The closing of the inlet and the outflowing of air to-the exhaust of course results in a reduction of pressure at the rear end of the plunger so that the plunger commences to move backward substantially as soon as the exhaust is uncovered. During the downward movement of the plunger, the valve 4 remains closed so that there is no additional supply of air to the rear end of the plunger during its rearward movement, the only cushioning effect being secured by reason of the air behind the plunger which does not entirely escape when the exhaust is uncovered. The valve 4 does not move down during the downward movement of the plunger, as the sure backed" through the passages 5, 6 and 8 causes the valve to move sharply to itsllowermost position, opening the passage -5-,' and permitting a new charge of air to flow plunger, by reason of the passage 12, butvv inasmuch as this passage 12 is of much less capacity than. the passages 9, 8 and 7, the pressureupon. the upper end of the valve 4 is increased somewhat beyond that upon the lower endofthe valve, when the plunger reaches, its lowermost. .position, so that this unbalancing of pressure operates in connection with the momentum of the valve 4 to secure a sharp opening movement of such valve. This completes the cycle of operation. The valve 4 will thus be seen to be pressure actuated to close the inlet and actuatud by the jolt of the table to open the inet."

. In the modified type of construction illustrated .Fig. 2, A is th e cylinder; B is the anvil; C is the table; 1) is the plunger; E. is the inlet port, and. F is the exhaust port, communicating with the chamber H. Inthis construction, the valve chamber 1' in the plunger D is provided with a valve 4;

, in,the form of aball and this chamber is completely closed upon its lower side. by means of the screw-plug2, having a stem 3' ,Thepassages 7 .8 and 9 lead from the uppergen d of .the chamber 1 to the rear end of the, plungeras in the other type of construction; The chamber 1 is also provided with, an additional side port 13, and the groovesb' ,and lO in the plunger D correspondto the grooves 5 and 10 in the other type. of apparatus. j v

,7 The peration of this apparatus of Fig. 2isaslfollowsz When air is admitted to the port it passes to the rear end of the plunger viathe passages 7, 8 and 9, thus causing. the plunger tomove upward. Thismove'ment continues until, the upper endof the, groove 10 is brought into communication with the exhaust port F at which time exhaust occurs from the rear end of, the plunger; .During this upward movement of the plunger, the ball valve 4 occupies the position indicated in the drawing, but as soon as the exhaustis opened and as scenes the passage 13 is brought into registration with the inlet valve E, the valve 4c is causedto, move upwardand seat by reason of the increased pressure upon its lower side, this cuttingv off communication between the inlet an .exhaust ports and between .the inlet port and the rear end of the plunger. The supply of .air, to the rear end of the plunger new being cut off and the exhaust being open, the descends, the ball valve 4' during 5116b movement oecii'pyihg its closed posithe momentum of the ball valved causes it to move to its lower position, such movement readily occurring by reason of the fact that the pressure upon opposite sides of the valve 4 .isequalized, due to the backing up of pressure in the passages 9, 8 and 7 during the descent of the plunger. This condition in connection with the vmomentum of the valve secu res a sharp and efi'ective o bening movement of thevalve when the p unger reaches itslower position, so that the parts are in position for a repetition'of the cycle as above described. it

Having thus described my invention and illustrated its use, what I claim as new and desire to secure by Letters Patent is the'following:.

1. In combination in a jolt ramming machine, a cylinder, a piston provided with a passage therethrough leading from the side of the piston to the lower end thereof, an inlet passage through the side of the cylinder adapted to register with the first passage when the piston is ,in itslower position, an exhaust passage through the side of the cylinder adapted to register witha portion of thefirst passage when the, iston approachesits upper position, an a valve in the piston adapted to be closed by the unbalanced air pressure induced when theexhaust passage is, brought into communication with the said passage in the piston. 1 I

2. In combination in a jolt ra mm'ing machine, a cylinder provided with inlet and exhaust ports, a plunger in the cylinder having a valve chamber providing communication from the inlet port to the rear end of the plunger, and a valve inthe chamber arranged to permit a flow of air to the rear end of the plunger during a predetermined upward movementof the plunger and to antomatically cut off such' flow when the en haust port is uncovered.

3. In combination in a jolt ramn'iing machine, a cylinder provided with inlet and exhaust ports, a plunger in the cylinder having a valve chamber providing communicationtrom the inlet port to the rear end of the plunger, and a valve in the chamber arranged to permit a low of air to the rear end of the plunger and to automatically cut oil such flow when the exhaust port is uncovered, the said valve being arranged so as to bemoved to open position by its own momentum when the piston is stopped in its downward movement. I I

+1. In combination in a jolt ramming machine, a cylinder having inlet and exhaust ports,.a plunge'r having uponits interior a vertically extending valve chamber comiaaaaaa municating with the inlet port and with the cylinder to the rear of the plunger, and a vertically movable valve in the valve chamchine, a cylinder having inlet and exhaust ports, a plunger having upon its interior a vertically extending valve chamber having a connection from its front end leading to the rear of the plunger and a connection from its rear end also leading to the rear of the plunger, the said chamber having connections registering with the inlet port at one extreme of movement of the plunger and with the exhaust port at the other extreme of movement of the plunger, and 'a valve in the valve chamber adapted to be closed by the unbalancing of the air pressure onits opposite sides induced by the uncovering of the exhaust port, and arranged so as to remain closed cutting oil the supply of air to the rear of the plunger until the plunger reaches its lower posie tion.

6. In combination in a jolt ramming machine, a cylinder having inlet and exhaust ports, a plunger having upon its interior a vertically extending valve chamber having a connection from its front end leading to the rear of the plunger and a connection of smaller area from its rear end also leading to the rear of the plunger, the said chamber having connections registering with the inlet port at one extreme of movement of the plunger and with the exhaustport at the other extreme of movement of the plunger, and a valve in the valve cham ber adapted to be closed by the unbalancing of the air pressure on its opposite sides induced by the uncovering of the exhaust port, and arranged so as to remain closed cutting off the supply of air to the rear of the plunger until the plunger reaches its lower position.

7. In combination with a jolt ramming machine, a cylinder, a piston provided with a passage leading from the side of the piston to the lower end thereof, an inlet passage through the side of the cylinder and a valve in the piston arranged to control the flow of air to the lower end of the piston, said valve being pressure-actuated 'to cut ofl the flow of air after the piston is moved a predetermined distance upward and being closed by is own momentum on downward movement of the piston.

8. In combination in a jolt ramming machine, a cylinder, a plunger provided upon its interior with a vertical valve chamber and a valve in the chamber for controlling the flow of air to the lower side of the plunger, said valve being held in open position by fluid pressure during a predetermined upward movement of the plunger and automatically closed upon reduction of pressure and adapted to be moved to open position by its own momentum when the plunger is stopped in its downward movement.

9. In combination in a jolt ramming machine, a cylinder provided with inlet and exhaust ports, a plunger in the cylinder having a valve chamber providing communication from the inlet port to the rear end of the plunger, and a valve in the chamber arranged to permit a flow of air to the lower end of the plunger during a predetermined upward movement of the plunger and to automatically out off such flow when the exhaust port is uncovered, said valve being moved to open position by its own momentum when the plunger returns to lower position.

In testimony whereof I have hereunto signed my name in the presence of the two subscribed witnesses.

AUGUST EvArn oBEnc.

Witnesses:

E. H. MUMFORD, ASA F. RANDOLPH. 

